Preparing method of modified neodymium-iron-boron magnetic powder, modified neodymium-iron-boron magnetic powder and neodymium-iron-boron sintering body

The invention relates to a preparing method of modified neodymium-iron-boron magnetic powder, the modified neodymium-iron-boron magnetic powder and a neodymium-iron-boron sintering body. The preparingmethod of the modified neodymium-iron-boron magnetic powder comprises the steps of 1, adding unmodified neodymium-iron-boron magnetic powder into an organic solvent medium containing a modifier, andconducting ultrasonic dispersion and stirring to make the modifier connected to the unmodified neodymium-iron-boron magnetic powder through chemical bonds; 2, adding an unsaturated monomer and an initiator into the organic solvent medium in which the neodymium-iron-boron magnetic powder is dispersed, and conducting ultrasonic dispersion and stirring to make the unsaturated monomer and the initiator subjected to a grafting reaction; 3, making the unsaturated monomer subjected to a polymerization reaction to form a wrapping layer and obtain the modified neodymium-iron-boron magnetic powder. According to the preparing met